Clinical evaluation and comparison of different criteria for classification in Turkish patients with psoriatic arthritis.

Several criteria are being used for the classification of psoriatic arthritis (PsA) and there is a lack of consensus about PsA as a separate entity. Our aim is to investigate the clinical features of our patients with a clinical diagnosis of PsA, compare the sensitivities of different classification criteria and agreement between the criteria. In this study 86 PsA patients were investigated (48 female, mean age 44). Moll and Wright criteria were fulfilled by 91%, Vasey and Espinoza criteria by 94% and modified European SpA study group criteria by 59%, classification of PsA study group criteria by 86%, modified McGonagle criteria by 96%, Fournié et al. criteria by 84%, and Gladman criteria by 95%. Significant agreement was present between criteria but generally kappa values were less than 0.5. The pattern of PsA can differ with time and the implementation of the available classification criteria showed considerable differences.